From 682a0f271f8b9a5842679a0f7070139a1f456c0d Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Thu, 10 Mar 2011 22:05:16 -0500
Subject: [PATCH] fix failure behavior of sem_open when sem does not exist

---
 src/thread/sem_open.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/thread/sem_open.c b/src/thread/sem_open.c
index 6fff71a8..809925d2 100644
--- a/src/thread/sem_open.c
+++ b/src/thread/sem_open.c
@@ -100,7 +100,7 @@ sem_t *sem_open(const char *name, int flags, ...)
 					close(tfd);
 					unlink(tmp);
 				}
-				if (fstat(fd, &st) < 0) {
+				if (fd >= 0 && fstat(fd, &st) < 0) {
 					close(fd);
 					fd = -1;
 				}
@@ -118,6 +118,10 @@ sem_t *sem_open(const char *name, int flags, ...)
 				break;
 			}
 		}
+		if (!(flags & O_CREAT)) {
+			pthread_spin_unlock(&lock);
+			return SEM_FAILED;
+		}
 		if (!linkat(AT_FDCWD, tmp, dir, name, 0)) {
 			fd = tfd;
 			close(dir);
-- 
2.25.1